Malicious PDF — malware analysis report

Static analysis result for SHA-256 24aef864d33ce2ec…

MALICIOUS

PDF

92.5 KB Created: 2021-05-27 11:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f8a21be7a99fbcb0560e3112cb68161 SHA-1: 4d2ff10e1fde60ef7a1eca01a505f8ab7a09bf82 SHA-256: 24aef864d33ce2ec0cf31349beaf4af373df9bb08a292ca3727c50c4edc4399a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, identified as a link farm, and a specific URL related to a game ROM hack download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/strik?utm_term=pokemon+mega+delta+nds+rom+hack+download
    • https://wisetigu.weebly.com/uploads/1/3/4/3/134357320/7604318.pdf
    • https://burazukukoxuvi.weebly.com/uploads/1/3/4/0/134096138/1f10e0d60a3c9.pdf
    • https://cdn-cms.f-static.net/uploads/4481064/normal_5fd61a6ead9c2.pdf
    • https://cdn-cms.f-static.net/uploads/4371005/normal_605cb298b58dc.pdf
    • https://sezowizubuv.weebly.com/uploads/1/3/0/8/130874308/101ae0524f7556.pdf
    • https://static.s123-cdn-static.com/uploads/4389127/normal_5fc7611295486.pdf
    • https://luvijitakum.weebly.com/uploads/1/3/4/6/134685142/zuzutagemonoxa.pdf
    • https://cdn-cms.f-static.net/uploads/4481509/normal_6029d61d3885c.pdf
    • https://cdn-cms.f-static.net/uploads/4383798/normal_600d174b3482c.pdf
    • https://cdn-cms.f-static.net/uploads/4420039/normal_6060248e6ade6.pdf
    • https://todegebonuvakef.weebly.com/uploads/1/3/1/6/131606144/sanurefa.pdf
    • https://cdn-cms.f-static.net/uploads/4485156/normal_604a8bf746c06.pdf
    • https://static.s123-cdn-static.com/uploads/4426549/normal_5fe0f9132f1b0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/82524405-8f0d-4913-8d34-7eacb1cd323f/foluwudajibuzaxewagu.pdf
    • https://uploads.strikinglycdn.com/files/90e55a39-1a9a-4036-8a9b-e7e3d041ffba/why_does_the_power_light_on_my_tv_blink.pdf
    • https://uploads.strikinglycdn.com/files/dbdce7f6-1f49-44e8-8f60-c00802c79269/24253441643.pdf
    • https://uploads.strikinglycdn.com/files/b9937dfd-f066-44f6-9c1a-1e919554cbe1/minecraft_forge_14.23.5.3.pdf
    • https://uploads.strikinglycdn.com/files/80fe27eb-8226-4354-bb04-b2f5a58ba223/guwutaruzasinagojevoxorut.pdf
    • https://uploads.strikinglycdn.com/files/b399a694-171d-4a89-aedf-f8b2f3d2ff6b/senuwilizuparepeg.pdf
    • https://uploads.strikinglycdn.com/files/095a6978-f141-4ba7-b699-e55aed4b8f3b/17746950897.pdf
    • https://uploads.strikinglycdn.com/files/20379c42-ceb7-4cbc-9ad0-f201421993a1/cateye_computer_review.pdf
    • https://uploads.strikinglycdn.com/files/a51f3abe-5d71-400c-a601-9edfd838881d/65957493774.pdf
    • https://uploads.strikinglycdn.com/files/64c7ed16-df9c-4882-874e-9aaf81b6151d/zexusu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011db2.bin
84b517624edd0e737bb6e092160c1ff350096f4f9b0e4c43f70ff3a38146baf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB2 5252 bytes
font_01_sfnt_off00012f6d.bin
79ced131ce12907336c75c78987c2798b01caab19905bd829c22ed0b4b77b6b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6D 10916 bytes
font_02_sfnt_off00015481.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15481 4324 bytes